1. open door freedom of access
  2. endorse approve of
  3. indoors within a building
  4. open-source of or relating to or being computer software for which the source code is freely available
  5. ponderous having great mass and weight and unwieldiness
  6. epanodos repetition of a group of words in reverse order
  7. appendix a small sac attached to the large intestines of some animals
  8. epenthesis the insertion of a vowel or consonant into a word to make its pronunciation easier
  9. ponderosa common and widely distributed tall timber pine of western North America having dark green needles in bunches of 2 to 5 and thick bark with dark brown plates when mature
  10. inodorous having no odor
  11. indorse sign as evidence of legal transfer
  12. outdoors outside a building
  13. abundance the property of a more than adequate quantity or supply
  14. Apeldoorn a city of east central Netherlands
  15. openwork ornamental work having a pattern of openings
  16. open-door policy the policy of granting equal trade opportunities to all countries
  17. pendulous hanging loosely or bending downward
  18. operator an agent that operates some apparatus or machine
  19. openness without obstructions to passage or view
  20. open house an informal party of people with hospitality for all comers